This standard applies to all electronic equipment for control, regulation, protection, supply, etc., installed
on rail vehicles and associated with:
- either the accumulator battery of the vehicle;
- or a low voltage power supply source with or without a direct connection to the contact system
(transformer, potentiometer device, auxiliary supply);
with the exception of electronic power circuits, which conform to EN 50207.
This standard covers the conditions of operation, design, construction, and testing of electronic
equipment, as well as basic hardware and software requirements considered necessary for competent,
reliable equipment.
Additional requirements in other standards or individual specifications may complement this standard, if
they are justified.
Specific requirements related to practices necessary to assure defined levels of functional safety are to be
determined in accordance with 4.6.3.1 and 4.6.3.2 of EN 50126 and its informative Annex A.
Software safety integrity level of 1 or higher shall only be considered when it is shown that a residual
safety risk remains and that it has to be carried by the software driven programmable electronic system. In
such a case (i.e. software safety integrity level 1 or higher), EN 50128 is applicable.
For the purpose of this standard, electronic equipment is defined as equipment mainly composed of
semiconductor devices and recognized associated components. These components will mainly be
mounted on printed boards.
BS EN 50155:2007 Referenced Document
EN 50121-3-2:2000 Railway Applications - Electromagnetic Compatibility - Part 3-2: Rolling Stock - Apparatus
EN 50125-1:1999 Railway Applications - Environmental Conditions for Equipment Part 1: Equipment on Board Rolling Stock (Incorporating corrigendum May 2010)
EN 50128:2001 Railway Applications - Communications@ Signalling and Processing Systems - Software for Railway Control and Protection Systems
EN 50163:1995 Railway Applications Supply Voltages of Traction Systems
EN 50207:2000 Railway Applications - Electronic Power Converters for Rolling Stock
EN 60068-2-2:1993 Basic Environmental Testing Procedures Part 2: Tests Tests B : Dry Heat (Incorporates Amendment A1: 1993)
EN 60068-2-30:2005 Environmental Testing - Part 2: Tests - Test Db and Guidance: Damp Heat, Cyclic (12 + 12 Hour Cycle)*， 2024-04-18 Update
EN 60249-2-15:1994 Base Materials for Printed Circuits Part 2: Specifications Specification No. 15: Flexible Copper-Clad Polyimide Film@ of Defined Flammability (Incorporates Amendment A1: 1994)
EN 60352 Solderless connections - Part 8: Compression mount connections - General requirements, test methods and practical guidance*， 2011-03-01 Update
EN 60352-1:1997 Solderless Connections Part 1: Wrapped Connections - General Requirements, Test Methods and Practical Guidance
BS EN 50155:2007 history
2021BS EN 50155:2021 Railway applications. Rolling stock. Electronic equipment
2017BS EN 50155:2017 Railway applications. Rolling stock. Electronic equipment
2007BS EN 50155:2007 Railway applications - Electronic equipment used on rolling stock
2001BS EN 50155:2001 Railway applications - Electronic equipment used on rolling stock
1996BS EN 50155:1996 Railway applications. Electronic equipment used on rolling stock